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'''Taisei Kōki K.K.''' (大成光機{{kabu}}) was a Japanese camera maker based in Tokyo in the 1950s.<REF> The address was Tōkyō-to Itabashi-ku Itabashi-chō 3–481 (東京都板橋区板橋町3の481) from 1952 to 1957 and Tōkyō-to Itabashi-ku Kumano-chō 45 (東京都板橋区板橋町3の481) in 1958 and 1959. Source: advertisements reproduced in {{Kokusan}}, pp.120 and 223. </REF>

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The company was created in May 1949 by the merge of '''Narimasu Kōki''' (成増光機) and Daiyū Kōgaku (大由光学).<REF name="KME Yazawa"> [http://konicaminolta.jp/about/corporate/group/bmec/outline.html Company profile of Konica Minolta Electronics], and Yazawa, p.12 of {{CCN}} no.247. </REF> (The name "Taisei" 大成 was formed of the first characters of the two former company names.)

|image_text= Factory shown in ad for [[Welmy Six and Mount Six|Welmy Six L]]<br>(1955 in [[Photo Art]] special issue)<br>

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'''Taisei Kōki K.K.''' (大成光機{{kabu}}) was a Japanese camera maker based in Itabashi, Tokyo in the 1950s.<REF> The address was Tōkyō-to Itabashi-ku Itabashi-chō 3–481 (東京都板橋区板橋町3の481) from 1952 to 1957 and Tōkyō-to Itabashi-ku Kumano-chō 45 (東京都板橋区板橋町3の481) in 1958 and 1959. Source: advertisements reproduced in {{Kokusan}}, pp.120 and 223. </REF>

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The company was created in May 1949 by the merge of '''Narimasu Kōki''' (成増光機) and '''Daiyū Kōgaku''' (大由光学).<REF name="KME Yazawa"> [http://konicaminolta.jp/about/corporate/group/bmec/outline.html Company profile of Konica Minolta Electronics], and Yazawa, p.12 of {{CCN}} no.247. </REF> (The name "Taisei" 大成 was formed of the first characters of the two former company names.)

The company may have at least some distant relation to the company [[Fuji Kōgaku]] which existed until 1945.<REF> Tanaka, p.44, and [http://rd2h-ari.hp.infoseek.co.jp/LYRA_PIC.htm this page at Japan Family Camera], say that Fuji Kōgaku was split in two parts after the war: Taisei Kōki and Katsuma Kōgaku, with the latter keeping the Lyra brand name. This is not entirely accurate, though. </REF> (Taisei Kōki notably used the same Terionar brand name as the former Fuji Kōgaku.)

The company may have at least some distant relation to the company [[Fuji Kōgaku]] which existed until 1945.<REF> Tanaka, p.44, and [http://rd2h-ari.hp.infoseek.co.jp/LYRA_PIC.htm this page at Japan Family Camera], say that Fuji Kōgaku was split in two parts after the war: Taisei Kōki and Katsuma Kōgaku, with the latter keeping the Lyra brand name. This is not entirely accurate, though. </REF> (Taisei Kōki notably used the same Terionar brand name as the former Fuji Kōgaku.)

All three companies Fuji Kōgaku, Katsuma Kōgaku and Taisei Kōki used the Terionar lens name, and they have similar logos, showing a cemented doublet lens scheme, with a protuberance on top, maybe an allusion to Mount Fuji. The logo used by Taisei Kōki on the Welmy range is written ''TAISEI WELMY''.

All three companies Fuji Kōgaku, Katsuma Kōgaku and Taisei Kōki used the Terionar lens name, and they have similar logos, showing a cemented doublet lens scheme, with a protuberance on top, maybe an allusion to Mount Fuji. The logo used by Taisei Kōki on the Welmy range is written ''TAISEI WELMY''.

All the shares of the company were bought in August 1960 by [[Konica|Konishiroku]].<REF name="KME Yazawa" /> By the time, the company had ceased to sell cameras under its own name. In 1968, it moved from Itabashi to a new factory in the city of Tsuru (都留市, prefecture of Yamanashi).<REF name="KME Yazawa" /> In 1972, the company name was turned into '''K.K. Yamanashi Konica''' ({{kabu}}山梨コニカ).<REF name="KME Yazawa" /> In 1983, this was split into '''K.K. Konica Denshi''' ({{kabu}}コニカ電子, Konica Electronics) and other sub-companies.<REF> [http://konicaminolta.jp/about/corporate/group/bmec/outline.html Company profile of Konica Minolta Electronics] and [http://konicaminolta.jp/about/corporate/group/oop/ company profile of Konica Minolta Opto Products]. </REF> The company Konica Minolta Electronics Co., Ltd., distant descendent of Taisei Kōki, is still installed in the Tsuru factory.<REF> [http://konicaminolta.jp/about/corporate/group/bmec/outline.html Company profile of Konica Minolta Electronics]. </REF>

All the shares of the company were bought in August 1960 by [[Konica|Konishiroku]].<REF name="KME Yazawa" /> By the time, the company had ceased to sell cameras under its own name. In 1968, it moved from Itabashi to a new factory in the city of Tsuru (都留市, prefecture of Yamanashi).<REF name="KME Yazawa" /> In 1972, the company name was turned into '''K.K. Yamanashi Konica''' ({{kabu}}山梨コニカ).<REF name="KME Yazawa" /> In 1983, this was split into '''K.K. Konica Denshi''' ({{kabu}}コニカ電子, Konica Electronics) and other sub-companies.<REF> [http://konicaminolta.jp/about/corporate/group/bmec/outline.html Company profile of Konica Minolta Electronics] and [http://konicaminolta.jp/about/corporate/group/oop/ company profile of Konica Minolta Opto Products]. </REF> The company Konica Minolta Electronics Co., Ltd., distant descendent of Taisei Kōki, is still installed in the Tsuru factory.<REF> [http://konicaminolta.jp/about/corporate/group/bmec/outline.html Company profile of Konica Minolta Electronics]. </REF>

* Yazawa Seiichirō (矢沢征一郎). "Renzu no hanashi (157) Happī" (レンズの話[157]ハッピー, Lens story [157] The Happy). In {{CCN}} no.247 (January 1998). Nishinomiya: Camera Collectors News-sha. Pp.11–4. (On the creation and fate of Taisei Kōki. This contains the exact same information as in the [http://konicaminolta.jp/about/corporate/group/bmec/outline.html official history of Konica Minolta Electronics].)

* Yazawa Seiichirō (矢沢征一郎). "Renzu no hanashi (157) Happī" (レンズの話[157]ハッピー, Lens story [157] The Happy). In {{CCN}} no.247 (January 1998). Nishinomiya: Camera Collectors News-sha. Pp.11–4. (On the creation and fate of Taisei Kōki. This contains the exact same information as in the [http://konicaminolta.jp/about/corporate/group/bmec/outline.html official history of Konica Minolta Electronics].)

== Links ==

== Links ==

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In French:

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<!--Commented out link, page no longer present/availabe, please remove if not returned by 01/2016 In French:

All three companies Fuji Kōgaku, Katsuma Kōgaku and Taisei Kōki used the Terionar lens name, and they have similar logos, showing a cemented doublet lens scheme, with a protuberance on top, maybe an allusion to Mount Fuji. The logo used by Taisei Kōki on the Welmy range is written TAISEI WELMY.

All the shares of the company were bought in August 1960 by Konishiroku.[2] By the time, the company had ceased to sell cameras under its own name. In 1968, it moved from Itabashi to a new factory in the city of Tsuru (都留市, prefecture of Yamanashi).[2] In 1972, the company name was turned into K.K. Yamanashi Konica (㈱山梨コニカ).[2] In 1983, this was split into K.K. Konica Denshi (㈱コニカ電子, Konica Electronics) and other sub-companies.[4] The company Konica Minolta Electronics Co., Ltd., distant descendent of Taisei Kōki, is still installed in the Tsuru factory.[5]

↑ Tanaka, p.44, and this page at Japan Family Camera, say that Fuji Kōgaku was split in two parts after the war: Taisei Kōki and Katsuma Kōgaku, with the latter keeping the Lyra brand name. This is not entirely accurate, though.